339K&Counting

At 15,000, I figured it was time to switch the drivetrain over to synthetics. Did the front and rear diff.
I want to use DC recommended fluids while truck is in warranty.
The transfer case takes ATF+4. I can't find a store that sells it. Has anyone bought a synthetic ATF+4.
How about a synthetic for the NV5600? I don't believe the Mopar product or the Pennzoil Sychromesh product are synthetic.
After warranty, I'll use the Redling MTL
TIA

bulabula

Lotsa folks running Mobil1, Redline, Amsoil, RP, etc with great success; during the warranty period.

I'm running Amsoil throughout, but will try Redline MTL in the tranny next time.

Keep records, you'll be covered.

Equalizer 2

Just bought a 5 gal can of 75W90 Valvoline Synthetic at the local NAPA, it is a GL-5 oil as is required. Figure if Cummins endorses thier motor oil the gear oil should be good enough. Caught the gear oil on sale and it was only $109 works out to $5.45 a quart. Lots cheaper than buying it by the quart.

The 6 speed tranny calls for Mopar manual transmission fluid P/N 4874464 but no other info is available. Anybody know the after market equivilant?

For the tranny the Owners Manual says it only needs topped off and not changed but I have a hard time with that.

nickleinonen

same fluid is used on the nv3500 tranny. gm uses them too... if you can find synthetic for the nv3500, it will be ok for the nv5600

ttreibel

Don't use 75w-90w in the NV-5600 it needs Redline MTL90 or the Factory stuff 75w-90w is made for the NV-4500 and can be used for the front and rear Diffs but not the NV-5600.

BTW Amsoil makes a product also I will let somebody chime in on that product, The Redline can be found in most cities at about 10 bucks a quart